It feels good to be back on bimmerpost, just picked up my new sdrive35i with m sport 6spd, and feeling the urge for more power. I was wondering if anyone could point me to the correct direction. Currently I'm considering the jb4, anyone know if the dealership can detect it and void my warranty? also does it have any reliability issues? Any info will be greatly appreciated. Thanks

Procede is also a very good tune. I have run both and if you are mainly doing city driving then I would suggest the procede as it is a very smooth tune while the jb4 has a more kick in the pants feel. You can't go wrong with either one especially the sale they have going on the jb4 right now. Both have 15 day money back guarantees so by both and keep which one you like more.